These kind of things just happen often. I get it sometimes and I just wait an hour or replug my internet or something like that, or even wait a few minutes, and 70% of the time it's fixed then, especially if it has to do with my internet instead of the website. I wouldn't give it too much thought if I were you because it really isn't that big of a deal. This just happens because it is the internet and it is not always 100% stable. If you really get it that often then it probably is your own connection because I am not at all experiencing that with PC as much as you say you do. Also I wouldn't compare websites with eachother because they are all different, they have different hosts and all that and they are just maintained differently. Just don't worry about it too much, it will get fixed either by itself or by someone else if you are just a little patient.